(Reuters) -Britain’s Informa agreed to sell its pharma intelligence business to New York-based investment fund Warburg Pincus for 1.9 billion pounds ($2.58 billion), the events organiser said on Thursday. Shares in the world’s largest exhibitions group rose more than 4% to their highest level since Nov. 2020 as it plans to return a portion of the proceeds to shareholders through a share buyback. Pharma Intelligence, which provides data on clinical trials, drug treatments and medical devices, accounted for about 40% of Informa’s Intelligence division in 2020. Informa said it would retain about …